Rock-drill.



Pa/ntea 11f1y16,1916.

, 2 SHEETS-SHEET l.

0. E. CLARK.

ROCK DRILL.

APPLlcATmN FILED $1111.30. 1914.

`ist

-v chuck, and the piston Will 'f strike itsiblow f and return withoutthev rear vends ofthe' .I shown, extends axially through the tubularsupply member 1-6, through theconstant' pressure chamber V15 and intothe bore 22. Its cross sectional area is less than saidbore 22 andalsoless thanthe reducedv portion 23. Y. It will thus'be seenthat fluidin the constantl pressure chamber 15 can' flow through the bore 22--235around the tube24, and thus gain access. tothe bore 14 of the drill bitlIt Willb'e noted that-'the front portion oi' vthe tube has its iexteriorfaces cut-'away or chain neled, as shoivnfat 31., so that this portionis.

of less cross sectional area than the rear por` tion. 'These channels31, however, terminate attlieir reaiy-"ends'at va point on the tube#that is not located in thefconstant pressure f chamber 1.5 when 'thepiston 10 is at the end of its norma-l Working stroke, as shown inl Fig.1.r The piston 10, however, has a variable stroke.' For example,v if thedrillingv machineiis lifted slightly withrespect to the i drill bit, sothat' said drillfbit does not eX-v tend into the chuck to the normalposition shown in Fig. 1, then, as villustrated in'iFig.

2, the piston has a longer stroke which isl sutl'icient to expose' the.'rear ends of the channels 31 in the constant pressure chamber 15. -Asaresult of'ithis arrangement,

While there'is always a limited iloivoffiuid from the constant pressurechamber around the tube 24 to the drillp'bit, a greatly in-f, creasedflow occursy When the 'parts operate as illustratedinFig. 2.

Briefly described, the operation of the apaiatus is substantiallyas'follows: Assuin.-' ing that the fluid under pressure being suppliedthrough the tubular-member 1,6 to the constant pressure' chamber 15,vthis fluid is distributed through the ports 21, .a

portion of' it thus becomingthe actuating fluid for thepiston. becomesthe cleansing fluid that' escapes through the bore 23-22'to the drillbit. If Water or a liquid cleansing` agent isdesired, it is onlynecessary to admit the. same through the tube 24, whereupon it willbeprojected in a stream from the reduced iront end ofl the tube into therear end oi the y. drill bit, the-surrounding- 'column ot air or l fluid.under pressure coniiningnit and insuring its escape Iinto said drillbit. Under ordinary Working conditions; it will be `un-` derstood thatthe machine vislield n pressed against thework, so that the rear end ot'the drill bit 12 is disposed Well' Within`the channels 31 enteringthe-constant pressure chamber; It. however, thereis ,an accumulation ofdust or cuttingsar'o'und the drill bit, the natural thing 'tor theoperator to do isto move the machine back and forth, thc drill bit beingheld tothe machine by any of the well known devices. In this looseningaction ofthe operator, the` drill A portion, however,-

s'equently'l the Vpiston advances farther before striking its blow. As aconsequence the rear ends 31 of the channelsare uncovered,

as shown in` Fig. 2, and a large volume ot fluid at initial pressure 4isthus Jforced through the drill bit.

.bit thus is advancedin the chuck, and 'corr From the-foregoing, it isthought that the construction, operation and many advantages of theherein describ'edinventioii .will

be apparent to ythose skilled in. the art, with? out furtherdescriptionfand it will be understood that various changes vin thesize,. shape, proportion and minor details 'of con-- struction may. beresorted` to without deof the advantages of 'the invention.

sto

jpartingkfrom the spiritl or sacrificing. any

,i Having 4thus `itully described my inveni tion, what I` claim asy new,and desire'. toV

secure by Letters Patent, is

1. In drilling apparatus of vthe character set forth, the combinationwith a cylinder,

member', of a piston opera-ting therein and haringen internal constantpressure chamber, means for distributing fluid from sai-"d chamber 4tooperate the piston, and means for delivering fluid from said constantpressure chamber to the bore of a drill bit operated on by the drillhole.- A e 2. In drilling apparatus ofthe character set forth, 'thecombination with a cylinder member, of a piston operating therein andharing an internal constant pressure cliamber'. means` for distributingfluid from said chamber to operate the piston, and a conduit iiston forcleansin the p 5 l "toi-media the piston and leading from the constant'pressure chamber, said conduit communicating with theV bore of a drillbit yoperated by the piston for. 'deliverii'ig cleansing fluid thereto.p

3, In drilling apparatus seit forth, the combination with. a. cylindermember` having a front diill.-recei'\'ing fchuck, ot' a drill bit thatengagestherein, said bit having a vbore for cleansing fluid,

a piston operating in the cylinder member andv haring an internal"constant .pressure chamber, means for delivering Huid from thel chambertooperatenthe piston` and a, conduits formed in the piston tor corrveyiiigwiluid fromv the, constant presente chamber to' theboreof thedrill bite .4. Indrilling apparatus of therharacter setlforth, thecombinationfrwith a. cylinder .member having ay ,front drill-receiving'chuck, of' a drill bitwtliat enga-ges therein,

said bit having a bore for cleansing fluid,` a piston operatinginl thecylinder member# and having an internal constant pressure chamber,ports. leading fromythe constant pressure, chamber and delivering fluidalternately to. opposite ends of the piston to actuate the same, and aconduit extending :trom the pressure chamber..tlirough the ot thecharacter qidelivered. y. y y y i y i "6. `Iridrilling apparatusof thecharacter ysetforth, the combination With'a cylinder member, l of la.piston operating' therein and haying an internal constant ressure chain-.f leading from the constantpressure chamber, If"gofsaidyconduit.communicating with the bore i "wi amountxof fluid`delivered therethrough.

` .Indrillingjapparatus of the character l, set* forth, tlie`combination with a: cylinder 31 .nemben andaypiston operating thereinand g having ayariable stroke, of a conduit in the `pistolto@delivercleansing 'iiuid to ad'rlll 1 .)ibityoperatelQonthereb and means forconwytrollingtheyconduit` ywthej' yarled stroke i wofthe'fpifstonVarythe` amount of cleansing-"Huid eliyeredftherethrough.`

" 1 isetfolrth," thecombination `with 1a cylinder4 member and a pistonoperating thereiny and H l. l havingayariable stroke', of afconduitformed @gin theypistonyto deliverpcleansing 'fluid to a i `fjlocatedinlsaidconduit and adapted to vary the stroke ofthepiston varies. 9. Indrilling `apparatus of the character i `ifcenduit fformed.` in thepiston to deliver sectional areas, and means for Varying the i stroke`oftliepiston and thereby exposing different portions of said devicetovary the y famolmto or` delivering diiierent amounts of `cleansing lluidrto a drillb'it operated on by the piston. j` 11. :Inydrillingapparatus of themcharacter `ti "setforth,fthelco` ination with acylinderi l` `iront `endof` the piston `for conveying fluid y froni said chamberto the bore of' the drill`- piston" for `varying ythe amount of fluid soa conduit forme'd ,in t e "piston and o y l. der constant pressure and ifofa drilllbitoperated? on by the piston forI L\"fdeliveririg;\`cleansing `fluid thereto, and' meansjfor `varying the eftectivecrosssec`` tional "area51 ofgthe conduit to vary the I i8511n-Vdillingfapparatus ofthe character f iydriljbit operated]on`thereby-,land a device the amount ofcleansing.fluiddelivered.when

to permit the y l y 15. In drilling apparatus of the character set`forth,th"e ycombination" yvlth a c ylln er member;anda` pistonoperating therein, ,bf aY ymember andprojecting into the conduit, saidAdevicel'havin`g`- portions of dierent cross fcleansing uiddelivered tothe lling` apparatus of the `character setlqforthygthe combination witha cylinder trolled byfsaidlyari'able stroke of the piston o 'in andcontinuously passlng a portion `projecting into the bore, said devicehaving portions of different cross sectional areas that are respectivelyexposed on the difierent strokes of the piston to vary the amount ofcleansing fluid delivered to the drill bit.

` 12.` In drilling apparatus of the character `.set forth, thecombination with a cylinder' member and a piston operating therein, of

' means passing through the piston for introducing aliquid cleansingagent into a drill bit y operatedon by the piston, and means formed inthe piston and moving with. it for securing a supply of gaseouscleansing agent undelivering the sume to said drill bit.

13. In drilling apparatus of the character set` forth, the combinationwith a' cylinder' member and apiston operating therein, of a tubepassing through the piston for introducing ali uid cleansing agent intoa drill bit operate `on by the piston, a bore in the plston constitutinga conduit for directing a gaseous cleansing agent to said drillbit, andmeans forsupplying such gaseous agent under vconstant pressure to thebore.

14. In'` drilling apparatus of the character set `forth, thecombinationWith' acylinder member and a piston operating therein, and

having an internal constant pressure chamber and a bore extend-ingtherefrom for conducting'cleansing Huid from Vthe chamber to a drill bitoperated on by the piston, of a tube extending through the constantpres4 sure chamber and bore for delivering a l cleansing agent to saiddrill bit and having a smaller cross sectional area than the borepassage of fluid therethrough.

set forth, the combination with a piston having an internal constant ofmeans for delivering fluid under pressure to `said chamber, means formedin the piston for distributing said fluid alternately to opposite endsof the piston for actuating the same, said piston having an axial boreeX- ,tending from the constant pressure chamcross sectional area thanthe bore. i

16. In dr1ll1ng apparatus of the character set `forth, the combinationwith a piston, of means formed in the piston for creating a body offluid under constant pressure therepressure chamber,

llO() such luid therethrough to 'a drill bit-0o erated on bythe'piston,and a tube exten ing through the piston for delivering a cleansing agentto the said drill bit, said `tube constituting means for vcontrollingthe amount of iuid passing through' thepiston by the iirst-mentionedmeans. Y17. In drilling apparatus of the character set forth, thecombinationwith a piston,

of a bore in the piston, constituting a conduit Ator passing uidtherethrough to a drill bit operatedV on by the piston, a tube extendingthrough the piston for delivering a cleansing agent to such drill bit,said tube having portions of diil'erent cross sectional area, and meansfor exposing diierent portions to permit varying amounts of iiuid topass throughsaid bore around the tube.

18. In drilling apparatus of the character set forth, the combinationWith a cylinder member, of a reciprocatory piston operating therein andhaving an interna-l constant pressure chamber, a tubular supply memberprojecting forwardly into the constant pressure chamber, ports leadingfrom said preslsure chamber-.andalternately delivering to opposite ends`of the piston for actuating the same, said piston having an axial borej' extending from the constant pressure 'chamber to its front end fordelivering cleansing fluid from the chamber to aw drill bit operated onby the piston, and a tube extending longitudinally through the supplymember,

l `the constant pressure chamber and the bore for d. .vering a cleansingagent to said drill bit, said tube havi-iig its iront portion of lesscrossI sectional area than its rear portion, andthe tube furthermoidebeing of less cross sectional area than the lbore Ato perl mit thepassage 'of the. cleansing: agent 40 through said bore around the tube,said piston having a variable stroke and uncoveringI the portion of thetube having the smaller j cross sectional area in the constant pressurechamber only when on its llonger stroke. 45

19.- In drilling apparatus ofthelcharacter set forth, the combinationwith acylinderV member anda piston operating therein and having.anfinternal chamber, of means for `delivering cleansing fluid from thechamber 5C' to the bore of a drill bit operated on by the piston, and adevice attending"z into the chamber for controlling the amount: ofcleansing iiuid discharged therefrom through said delivering means. 55

20. In, drilling apparatus of the. character set forth, the combination-J'vith a cylinderI member anda piston operating therein and 4 havinganinternal chamber, of means forv delivering cleansing fluid from thechamber 60 l to the-bore of a drillbit operated ion by the piston, saidmeans including a discharge:v port extending from the front end ofthechamber, and a device extending the front end of said device coperatinwith the discharge port to control thel amount of cleansing luiddischarged therethrough.

In testimony whereof I have hereunto set '70,

my hand in presence of two subscribing Wit-- nesses. l

OMAR E. CLARK.- v Witnesses :I n A WHJLIAM II. LEONARD, JAS. R.ELMnNnonF.

into. than rear end of the piston and .into the chamberf-i' f

